Anyone who wants to get up to speed quickly with LibreOffice will find this Getting Started Guide valuable. You may be new to office software, or you may be familiar with another office suite.
This book introduces the main components of LibreOffice:

Writer (word processing) Calc (spreadsheets) Impress (presentations) Draw (vector graphics) Base (database) Math (equation editor)

It also covers some of the features common to all components, including setup and customization, styles and templates, macro recording, and printing. For more detail, see the user guides for the individual components.